/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshAttributeSet.h
The attribute is valid if either all attributes are empty or if the bone name attribute is not empty then all the other attributes must be either empty or their size is equal to the bone name attribute size.
bool CheckBoneValidity ( [EValidityCheckFailMode](API\Runtime\GeometryCore\UE__Geometry__EValidityCheckFail-) FailMode ) const